<template>
  <div class="login_container">
    <div class="login_box">
      <!-- 头像区域 -->
      <div class="avatar_box">
        <img src="../assets/images/logo.png" />
      </div>
      <!-- 表单区域 -->
      <div class="login_form">
        <el-form
          :model="ruleForm"
          status-icon
          :rules="loginFormRules"
          ref="ruleFormRef"
          label-width="0px"
          class="demo-ruleForm"
        >
        <!-- 用户名 -->
          <el-form-item prop="username">
            <el-input
              type="text"
              v-model="ruleForm.username"
              autocomplete="off"
              prefix-icon="el-icon-user-solid"
            ></el-input>
            <!-- 密码 -->
          </el-form-item>
          <el-form-item prop="password">
            <el-input
              type="password"
              v-model="ruleForm.password"
              autocomplete="off"
              prefix-icon="el-icon-question"
              show-password
            ></el-input>
          </el-form-item>
          <el-form-item class="btns">
            <el-button type="primary" @click="Login('ruleFormRef')"
              >登录</el-button
            >
            <el-button @click="resetForm('ruleFormRef')">重置</el-button>
          </el-form-item>
        </el-form>
      </div>
    </div>
  </div>
</template>

<script>
export default {
  data () {
    return {
      ruleForm: {
        username: '',
        password: ''
      },
      loginFormRules: {
        // 验证用户名与密码是否合法
        username: [{ required: true, message: '请输入用户名', trigger: 'blur' }, { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }],
        password: [{ required: true, message: '请输入密码', trigger: 'blur' }, { min: 6, max: 18, message: '长度在 6 到 18 个字符', trigger: 'blur' }]
      }
    }
  },
  methods: {
    Login (formName) {
      this.$refs[formName].validate(async valid => {
        if (valid) {
          const { data: res } = await this.$http.post('login', this.ruleForm)
          if (res.meta.status !== 200) {
            return this.$message.error('登录失败，用户不存在')
          } else {
            // 跳转到主界面完成的步骤
            /**
             * 1：将生成的token保存到本地的sessionStroge中,打开期间使用，
             * 2：通过编程式导航跳转到主页
             */
            // 保存token
            window.sessionStorage.setItem('token', res.data.token)
            // 跳转
            this.$router.push('/home')
            return this.$message.success('登陆成功')
          }
        } else {
          return false
        }
      })
    },
    resetForm (formName) {
      this.$refs[formName].resetFields()
    }
  }
}
</script>

<style lang="less" scoped>
.login_container {
  background-color: #2b4b6b;
  background: url('../assets/images/bg1.jpg');
  background-repeat: no-repeat;
  background-size: cover;
  height: 100%;
}
.login_box {
  width: 450px;
  height: 300px;
  background-color: #fff;
  border-radius: 3px;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  .avatar_box {
    height: 130px;
    width: 130px;
    border: 1px solid #eee;
    border-radius: 50%;
    padding: 10px;
    box-shadow: 0 0 10px #ddd;
    position: absolute;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: #fff;
    img {
      width: 100%;
      height: 100%;
      border-radius: 50%;
      background-color: #eee;
    }
  }
}
.login_form {
  position: absolute;
  bottom: 0;
  width: 100%;
  padding: 0 20px;
  box-sizing: border-box;
}
.btns {
  display: flex;
  justify-content: flex-end;
}
</style>
